The changes package, distributed with TeX Live, allows the user to manually markup changes of text, such as additions, deletions, or replacements. Changed text is shown in a different colour; deleted text is crossed out. The package allows definition of additional authors and their associated colour. It also allows you to define a markup for authors or annotations. (Here's another customised example using avatars for the author annotations.)
The changes package, distributed with TeX Live, allows the user to manually markup changes of text, such as additions, deletions, or replacements. This example customizes the package to show author annotations with avatars. (Here's a more conventional example without the avatars. )
A simple example demonstrating how to use some wiki markup syntax in LaTeX, using wiki.sty from the nicetext bundle. Be careful — not everything works, and some commands may break! See http://mirrors.ctan.org/macros/latex/contrib/nicetext/doc/wikicheat.pdf for a cheat sheet. If you're looking for markdown, check out this example!
This is an example document to show the use of headers and footers. "Special features" are a fancy header, initially made for a CV template, and a "final footer" which will only appear on the very last page.
The tutorial to go with it is here.